UT139 Series digital multimeters are newly designed to offer users better performance and higher safety rating. Totally over-load protection and unique structural design make it new type of multimeter with high performance/ price ratio and a best choice for electricians used in electrical maintenance and repairing.1. True RMS for the whole series;2. Measure signals with varied frequency (VFC);3. Measure large capacitance up to 100mF;4. Optional AC/DC 60A current clamps in different models to measure current up to 60A(1mv=1A);5. NCV designed for the whole series, a necessity for electricians;6. AA1.5V*2(5#) battery, easy for users to purchase and replace;7. Soft rubber holster is easy to stand 2m drop;8. Optional magnetic hanging strap offered to facilitate tests in special location;9. Fast to replace fuse, just by opening battery cover;10. Reliable with use of internal 2PCS fuses with high-breaking capacity;11. Protection against 600V input/1 minute from misconnection;12. Safety Rating: CAT III 600V.